32 results about "Isoprenol" patented technology

The invention provides a method for preparing 3-methyl-2-butenol (isoprenol) through isomerization of 3-methyl-3-butenol. A catalyst reaction system contains 1) a carbonyl iron compound, 2) an organic base, and 3) an epoxy group ligand. A solvent with an ether structure is added into an isomerization reaction, so that the activity of a catalyst can be improved, and the product selectivity is improved. During catalysis and separation, a mixed gas of carbon monoxide (CO) and nitrogen (N2) is introduced, wherein the volume content of the CO is 100-100000ppm. The catalyst and a raw material namely the 3-methyl-3-butenol are separated from a product namely isoprenol through rectification, and the catalyst does not need to be additionally separated. The catalyst keeps high activity and long life operation.

The invention relates to a new synthetic method of carane aldehyde acid lactone, caronic acid, caronic anhydride and key intermediates thereof. The method comprises using hydroxy protected isoamyl alcohol as initial materials, performing an addition of a double bond to generate a key intermediate with a three-membered ring, hydrolyzing ethyl ester and protective groups, and then controlling oxidation conditions to obtain the carane aldehyde acid lactone and the caronic acid respectively. The method has advantages of mild condition, high production security, easy industrial production, no metal residues, and no other waste liquid, waste residue and exhaust gas that pollut the environment, and can effectively reduce cost.

The invention discloses a 3-methyl-3-butenyl-1-alcohol production method. The 3-methyl-3-butenyl-1-alcohol production method is characterized in that isoprenol as a raw material undergoes an isomerization reaction in a fixed bed reactor, wherein an isomerization catalyst is Pd/SiO2; Pd content is in a range of 0.3 to 0.8%; a reaction temperature is in a range of 50 to 110 DEG C; reaction pressure is ordinary pressure; a molar ratio of hydrogen to isoprenol is in a range of 0.1 to 0.5; a mass space velocity is in a range of 2 to 5h<-1>; and organic chlorine content of isoprenol is in a range of 3 to 10ppm. Compared with the existing 3-methyl-3-butenyl-1-alcohol production method, the 3-methyl-3-butenyl-1-alcohol production method provided by the invention solves the problems that the existing 3-methyl-3-butenyl-1-alcohol production method has a high raw material consumption rate and a high production cost and can cause severe environmental pollution, and has the advantages of simple processes, abundant raw material sources, low production cost, high reaction yield and low pollution on the environment.

The invention provides a catalytic hydrogenation synthesis method for prenyl alcohol. The method comprises the following steps: under the action of a solid base catalyst, adding paraformaldehyde with a concentration of 93 to 97% and tert-butyl alcohol used as a solvent into a reaction vessel, injecting nitrogen into the reaction vessel to replace air in the reaction vessel, then adding isobutene into the reaction vessel, carrying out stirring, then carrying out a continuous reaction at 180 to 220 DEG C for 3 to 5 h and carrying out cooling, discharging and distillation; collecting prenyl alcohol obtained after distillation; and adding 3-methyl-buten-l-ol into a fixed-bed reactor and carrying out catalytic hydrogenation at 50 to 100 DEG C under the catalysis of a silica gel-loaded Pd catalyst promoted by Se and Ce so as to prepare prenyl alcohol. Thus, the method provided by the invention can improve reaction yield and selectivity of prenyl alcohol, overcomes the problems of corrosion and pollution existing in acidic catalysis, shortens reaction time and reduces production cost.

A method for analyzing a sample that contains a plurality of lipid isomers is described that involves forming one or more lipid metal ion adducts and transporting the one or more lipid metal ion adducts through a Mix of POPC+OPPC differential mobility spectrometer to cause separation of the one or more lipid metal ion adducts from each other. The lipid isomers can be chosen, for example, from fatty acids, glycerolipids, glycerophospholipids, sphingolipids, saccharolipids, polyketides, sterol lipids, and prenol lipids. Particular examples include phosphatidylcholine regioisomers such as 1-palmatoyl-2-oleoyl-sn-phosphatidylcholine (POPC) and 1-oleoyl-2-palmatoyl-sn-phosphatidylcholine and triacylglycerols containg palmetic and oleic acid groups. The metal chosen can include a cationization reagent that contains sodium, potassium, silver or lithium.

The invention discloses a method for continuously synthesizing 3,3-dimethyl-4-pentenoic acid methylester and relates to a compound synthesizing technology. Methyl-2-buten-1-ol and trimethyl orthoacetate are taken as raw materials, phenol is taken as a reaction catalyst, and the method comprises the following process steps of: (A) dispensing: continuously adding the trimethyl orthoacetate, the methyl-2-buten-1-ol and the catalyst phenol into a dispensing kettle, and uniformly mixing; (B) synthesizing and separating: continuously conveying the material in the dispensing kettle to a synthesis and separation tower for reaction, continuously separating out the generated byproduct methanol and excessive trimethyl orthoacetate on the top of the tower, and continuously extracting residue at the bottom of the tower; (C) distilling at reduced pressure: continuously injecting the residue of the synthesis and separation tower into a rectifying still, distilling at reduced pressure, and separating out the finished product 3,3-dimethyl-4-pentenoic acid methylester; and (D) storing: conveying the finished product 3,3-dimethyl-4-pentenoic acid methylester to a storage tank, and standing for later use. By the method, the synthetic yield of the 3,3-dimethyl-4-pentenoic acid methylester is improved, and full continuous operation of the process for synthesizing the finished product 3,3-dimethyl-4-pentenoic acid methylester is realized.

The invention mainly discloses a pentenoic acid methylester preparation method, which is characterized in that prenol and trimethyl orthoacetate are in pressurized reaction in the existence of catalysts, and the by-product methanol is recovered by rectifying, so that pentenoic acid methylester is prepared. The pentenoic acid methylester preparation process has the advantages that reaction time is only 12-15 hours by means of pressurizing and catalyst synthesis, and the content of the prepared pentenoic acid methylester is higher than 99.8%.

The present invention relates to a process for preparing 3-methyl-2-butenol (prenol) and 3-methyl-2-butenal (prenal) from 3-methyl-3-butenol (isoprenol), in which 3-methyl-3-butenol is subjected to a catalytic isomerization over a carbon-supported Pd catalyst in the presence of a gas mixture comprising 1% to 15% by volume of oxygen to obtain a first product mixture, and the first product mixture is subjected to an oxidative dehydrogenation over a Pd catalyst comprising SiO₂ and/or Al₂O₃ as support material, or over a carbon-supported Pd/Au catalyst in the presence of a gas mixture comprising 5% to 25% by volume of oxygen.

The invention contemplates certain polyethers, polyether derivatives, and methods of making and using those same polymers. For example, the starting materials can, e.g., citronellol, prenol, isocitronellol and isoprenol.

The invention relates to a catalyst and reaction process for preparing prenyl alcohol from isopentenyl acetate through transesterification. The reaction process comprises the step: carrying out transesterification under the action of a solid acid serving as a catalyst by taking isopentenyl acetate and n-alkanol as reaction raw materials to generate prenyl alcohol and certain acetate. The n-alkanolcomprises methanol, ethanol, propanol and butanol, and corresponding certain acetate is methyl acetate, ethyl acetate, propyl acetate and butyl acetate. The solid acid catalyst adopts Ir-Fe/CeO2/SiO2as a catalyst system. It is particularly noted that an important reaction process step for obtaining a target product with high yield (larger than or equal to 90%) is to firstly introduce H2 for a period of time in a reaction process, and then, turning to introduce N2. The reaction process has the remarkable advantages such as low economic and environmental costs as well as simplicity in productseparation and aftertreatment so as to have a good application prospect.